Refuse-discharge mechanism for furnaces



E. LUNDGREN. REFUSE DISCHARGE MECHANISM FOR FURNACES.

1 m 1T T. N 2 W 14 N Lhw I GE m M2 H m P APPLICATION FILED OCT. I4, 19H].

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2 SHEETSSHEET 2.

APPLICATION FILED OCT. 14, I918.

' Patented Oct. 12,

INVEN TOR.

ATTORNEY;

UNITED STATES PATENT OFFICE.

EDWIN LUNDG-REN, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORP ORATION OF PENNSYLVANIA.

BEFUSE-DISCHARGE MECHANISM FOR. summons.-

Specification of Letters Patent. Patented Oct. 12, 1920.

Application filed October '14, 1918. Serial No. 258,059.

This invention relates to refuse discharge mechanisms for furnaces or'stokers.

' Anobject of the invention is to produce a refuse discharge mechanism for stokers in which means are employed for insuring complete combustion of the fuel prior to its discharge into the ash pit.

A further object. 1s to produce .a refuse crushing and discharging device for stokers in which adjustable means are employed for controlling the crushing-operation and for relieving the crushing device of excessive strains.

These and other objects, which will be made more apparent throughout the further description, are attained by means of apparatus embodying the features herein described andillustrated in the drawings accompanying and forming a .part hereof.

In the drawings: Figure l is a diagrammatic sectional view. of an underfeed stoker equipped with apparatus embodying my invention. c

Fig. 2 is a fragmental sectional view on' an enlarged scale of a portion of the refuse discharge mechanism disclosed inFig. 1

Fig. v3 illustrates an embodiment of myinvention 3 employed in connectlon' witha doubleended stoke r.

In my copending application filed Feb, 9, 1918, and serially numbered 216,389, I have illustrated a refuse discharge mechamsm speciallyadapted for use in connection with underfeed stokers. The, present invention is a modification or improvement of the;

mechanism there disclosed, and while it'is primarily adapted for use in connection with underfeed stokers, it may, with slight modifications, be employed in connectlon with furnaces of other types.

The stoker illustrated in Fig. 1 consists of alternately arranged retorts 5 and air delivering fuel supporting surfaces 6. Fuel is fed into the forward end of each retort from a hopper 7 and by means of a plunger 8. The plunger is driven by any suitable.

motor or engine 8 through the medium of the connecting rod 21 I and the periodof its reciprocations may be varied to correspond 1 to the desired rate of fuel feed. The fuel fed into each retort isforced outwardly across the fuel supporting surfaces 6 and is also moved downwardly across the surface and through the .retorts toward the refuse discharge mechanism 9. As illustrated, the refuse discharge mechanism consists of a receptacle formed at therear end of the furnace and between the furnace and the bridge wall. The forward wall of the receptacle consists of an oscillating grate section 10, a stationary grate section 11, and

sides of a crushing and discharging roll 15' which, in effect, forms the bottom of the receptacle.

In Fig. 2, I have illustrated the grate section '10 in detail and, as shown, it 'includes a frame 16 which is fulcrumed-at 17 on a bracket mounted on a stationaryp'ortion of the furnace structure. ping grate bars 18 are mounted on the; frame .16 andare held in place by means of a locking bar 19 which is bolted or otherwise secured to the frame. As shown, the locking bar is provided with an upwardl extending lug 20 which engages. a

A series of overlap- I ownwardly projectingfoot 21 formed on the.

next adjacent grate bar and which prevents -..the grate bar from moving relatively to the locking bar.

'90 A similar lock is providedbetween each grate bar and the grate bar located immediately above it. The frame 16 is oscillated around the trunnion 17.,by means of "the stoker driving mechanism. As illustrated, the oscillating mechanism consists of'theconnecting rod-21' iv-' oted to a; crank arm 21" which is rotate by the motor 8', a link 22, a lever 23, and a link 24. The lever 23 is pivotally mounted on a bracket 25 secured to the stationary portion of the stoker frame and the link 24 is pivotally connectedto both the lever 23 and a bracket 26 formed on the lower end of the frame 16. 'With this arrangement the grate section 10'swings upwardly and in a direction substantially across the mouth of the receptacle; the motion of the gratefsection is however relatively small as compared to the width of'the receptacle and ismerely .tacle.

' ing section 11 is located immediately below adapted to break up refuse material dis charged into the receptacle and to prevent bridging across the mouth of the receps shown,'the stationary air deliverthe section and forms with that section the rear face of an air box 27 which receives air through a port 28 from an air supply passage 29 forming a part of the blast dej the passage 29 is provided with a damper .controlled inlet port 30. The structure just livery systemof the furnace. As shown,

described is omitted from Fig. 1, but is clearly illiistrated in Fig. 2.

The apron 12 is pivoted near its upper edge on a trunnion 31 which is supported in I suitable brackets mounted on the frame of the stoker. The upper edge, of the apron" is located adjacent to the lower edgeof the grate-section 11, and the lower edgeof apron is adaptedto be moved toward and away from the roll 15. The apron 14 is similar in some respects to the apron 11 and is pivotally mounted'at its upper endon a trunnion 32 which is in turn mounted on a .sta ,tionary bracket 33. The lower edge of this apron is also capableofbeing moved toward and away from'the roll 15. As shown, the

- two aprons 12 and 14-may be simultaneously adjusted from the. front of the stoker by means of a hand wheel 34. In the drawing the stemof the hand wheel is provided with Y a worm gear 36 which'meshes with a rack 37 pivotallymounted on a trunnion 38.

This rack is operatively connected to. a lever 39. bymeans of a.l-ink 40. The lever is ful- V crumed. at an intermediate point and one end is connected to the apron 12 by a link 41,

in one direction will move both aprons outwardly away from the roll, whereas. a move whereas theother end' is connected to the apron 14 by link 42, and a lever 43. With this arrangement a movement'of the rack 37 ment of the rack in the opposite direction will move them toward the roll.

In order to prevent injury of the aprons or of the roll 15in case the roll is incapable of crushing refuse material fed to it from the receptacle the aprons'are yieldingly held in the adjusted positions by means of a s ring 44 which forms a part of the link 40.

5 shown, the link is formed in two parts,

' one part including a housing for the spring 44 and the other part consisting of a rod which is .operatively secured to the spring housing by means of the spring.- The-arrangement is such that pressure on either apron tending to force it'outwardly will compress-the spring and thereby permit the apron move away from the roll without sub ect ng either the roll or the apron to undue strains.

The roll; 15 may be of the usualconstruc-- tion' and the operating mechanism may be similar to that described my before menare adapted to deliver blast to the up tioned application. The grate section 13 may be provided with'air discharge aper- ,tures 45 for delivering air under pressure to the material passing downwardly through the receptacle.- The grate bars 18 of the section 10 are preferably provided with air passages 46 for delivering air under pres sure to the material entering the mouth of the receptacle and the grate section 11 is also provided with air passages 47. With this arrangement fuel entering the receptacle is, provided with air under pressure and, in addition to this, the amount of air delivered may be controlled by the damper 49 controlling the port 30.

' In F 3, I have illustrated diagrammatically an' arrangement of my invention in connection-with two stokers located end to end. As illustrated, a refuse receptacle 50 .is provided between the two stokers. Two

clinker grinding rolls 51 are provided at the'bottom of the receptacle for crushing and discharging refuse contained in the receptaole. An apron 12 is located on each side of the rolls 51, and each apron may be individually controlled from the front of its corresponding stoker, although a connection such asv described in connection with Fig. 1 may be employed for simultaneously adjusting the position of-both aprons. Each furnace of Fig. 3 is shown provided with an oscillating grate section 10 and a stationary grate section 11', all of which sections er portion of the receptacle 50. It will, of

course, be understood that a spring connec- I tion such as the spring 44 may be employed between each apron 12 and its adjusting of the furnace passes, a recepta'clelocated below said section and into which refuse and fuel are moved by the movements of said section, including a refuse crushing and discharging device forming a bottom for said receptacle, and adjustable aprons located on each side ofsaid crushing and discharging device and means for 'yieldingly holding said aprons -in adjusted positions whereby the opening. movement of one apron actuates the opposite apron.

2. In combination with a stoke'r, a refuse crushing and discharging device, a recepr tacle above said device into ivhich refuse apron.

from the fuel supporting sections of the stoker is fed, including movable apronslocated on opposite sides of said device, and forming front and rear Walls of said 'rece tacle, means actuated from the front of t e furnace for adjusting the position ofsaid aprons with respect to the device, andyielding means for holdin Isaid aprons in adjusted positions where y the opening movement of one apron actuates the opposite 3. In combination with a stoker, a refuse crushing and discharging device, a receptacle located above said device and into which refuse from the fuel supporting portion of the stoker is fed, including movable aprons located on each side of said device and forming front and rear walls of said receptacle, means actuated from the front of the furnace for simultaneously adjusting the positions of said aprons, and means for yieldingly holding said aprons in adjusted position.

' and aprons 4. In combination with a stoker, a receptacle into which refuse from the fuel supporting portion of the stoker is fed, including a refuse crushing and discharging device forming the bottom of the said receptacle device and forming front and rear walls of said receptacle, means located at the located on opposite sides of said,

. tacle located at the rear of the 'fuel'supportincluding acfuel 4 ing portion of the stoker, crushing and discharging roll forming the a refuse bottom of Sitld' receptacle, and movable aprons located on opposite sides of said roll and forming parts of the front and rear walls of said receptacle, an oscillating air delivering fuel supporting section over' which refuse from the fuel supporting portion of the furnace is fed intosaid receptacle, means driven by the driving mechanism of the stoker for periodically oscil-.

lating said section, means located at the front of the furnace for adjusting the positions of said aprons and connections be tween said means and said aprons for yield ingly holding said aprons in'the adjusted positions. f y

In testimony whereof, I, have, hereunto subscribed my name this 8th day,of October', 1918. H

EDWIN LUNDGREN 

